Faculty of Engineering
ENG 2120 / EATS 2620
FUNDAMENTALS OF SURVEYING: LAB 8
Prof. Wang Jian-Guo
York University, Ontario Abstract:
This lab focuses on learning the skills on how to apply basic principles of
topographic surveys to topographic mapping and getting to know the field
procedures in this matter.
This lab was basically a long 1 part lab which involved taking point
measurements using the Total Station instrument. We were guided outside by
the TA and were advised to choose a location to set up the instrument that would
minimize the interference with the “Traffic” and that is convenient in order to see
as many points as possible. The next step was to accurately level the instrument
and measurement of the instrument height was followed using a tape. We
sighted a characteristic reference point and also set the horizontal circle reading
to zero. The points for each student was identified and sketched. One of the
team members was holding the target on those points and we started taking our
measurements of the slope distance, zenith angle and horizontal angle at each
point. The target height was also measured. Each student was doing 20 points
so our points were total of 100 points.
The intention of this lab is to familiarize students with the skills of topographic
surveying and mapping and also practicing the skills on an actual outdoor field.
The measuring instruments used in this lab are the Total station instrument used
in a lot of previous labs, tripod for setting up the instrument on it and a reflector
used as a target.
Total stations are Objectives:
To apply the principles of topographic surveys to topographic mapping in order to
gain the experience of field procedures of topographic mapping.
We practiced real topographic surveys outdoors. We made the decision on the
accuracy of the observation, the density of the points etc. the area to be
surveyed was identified by the TA and there was a certain degree of overlap in
the areas and it is expected that only one station with arbitrary coordinates and
elevation and a known orientation will be needed. Each team established a
reference station in such a way as to minimize interference with the “traffic” but at
a convenient location to be able to “see” as many characteristic points as
possible. The instruments must be set up and levelled accurately. Once this was
done, the instrument height was measured using a tape. Subsequently a
characteristic reference point was sighted and the horizontal circle reading was
set to zero. The second reading was reversed mode taken. Frequent checks of
the zero setting were